Golovkin would've done quite well in the 80s and 90s. Stylistically he'd be a tough opponent for almost anybody. Leonard and Hagler are probably the main two that would beat him. He'd probably beat Duran in a very grueling fight and would be in an extremely close fight with Hearns(Hearns tended to struggle with sluggers but gave outboxers trouble)
Golovkin in 80s-90s MW division.
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